Split 50H/250A into 2* 50H/125A

Dear all.
Im on a new boat with a shot power converter 50H/230V/440V with one shore cable 250A.
Most of the marinas just have shore power connection for 125A.
Anyone know any system to connect 2*125A to my shore cable of 250A?
Kindest regards

 

Look up Marinco shore connectors, they will more than likely have what you are looking for
There are other manufacturers

 

He is talking about connecting two three phase circuits in parallel, wich is different from collecting two phases for a split phase system.

What might be available is an adapter from the 250A plug to the 125A socket, but this depends entirely on what plug exactly is installed on the cable since 250A CEE plugs come in different variations (5P6h, 5P1h, 5P9h, etc.) and some combinations might be difficult to find. The most widespread 125A connector is probably the 5P6h one, so that's the adapter I would buy.

I'm curious, does your boat have a 170kW generator to match the 250A shore power cable?

 

I don't see a mention of 3 phase in his first post. I assumed that he needs 250 amp capability but needs to split the wire to hook up the 125 amp each at the shore connectors.
I have seen this configuration often.

 

Cross connecting two separate circuits is dangerous and illegal. If the marina has GFCI or arc-fault breakers they will be tripping each other. The best solution if you run two wires is to split the 220V panel.

 

Are you in Portugal?

 

Pigtail and Y Adapters
While docks for smaller boats are usually equipped with 30A power pedestals, and docks for larger boats are equipped with 50A pedestals, you may find when you arrive at a new marina that the pedestal at the dock doesn’t match your shore power cord. Let’s say, for example, that you’ve got a powerboat equipped with 50A, 125V service but the harbormaster sends you to an end-tie, and the dock only has 30A service.



Reverse Y-Adapter with one 50A female connector and two 30A male dockside plugs.

To get connected, you’ll need a pigtail adapter. These devices have a male plug at one end, and a female connector at the other, but in different plug configurations. In this case, we’d use a 30A to 50A adapter that makes the conversion from the 30A power pedestal to the 50A shore power cord on your boat. Note that these pigtail adapters have the same waterproof covers and rings as other shore power connections, so it’s a safe and secure connection.

We’ll mention some fine points here. The boat in the above example was wired with a 50A circuit because the builder anticipated that it would consume lots of power while docked. You can’t pull 50A out of a 30A circuit, or at least you can’t for very long! Therefore, you have to restrict your use onboard to less than 30A, or you’ll spend your time resetting the pedestal breaker.

There is a way for this vessel to find the power it needs in this situation, and that’s by using a Reverse Y Adapter. This converter connects to both of the 30A outlets on the shore power pedestal and determines if the hot and neutral are correctly polarized, and if the hots are opposite phase, and if both male plugs are connected properly. If not, a special circuit in the Reverse Y does not allow current to flow. If the wiring is OK, the Reverse Y provides 50A of 125/250V power to your boat.

 

That's because he doesn't need to explicitly mention it's 3 phase. 50Hz 230V / 400V is the european standard, where single phase is 230V and 3 phase is 400V.
400V/125A is 78kW and 400V/250A is 156kW, the equivalent US service would be 320A and 700A, 250V split phase system.
We are talking superyacht territory here, not your average dock shore power.

There is no reverse Y-adapter in Europe, all we have is a splitter to separate 3 phase into 3 single phases.

 

Got it, thanks

 

Dear Rumars. Thanks for your reply.
You are correct, what im looking is 2*125A in parallel to connect my 250A shore power.
Is there a kind of "box" where I can connect the 125A cables similar the picture attached?
I will be sailing mainly in the Med and as usual I need to have 3 or 4 diferente connectors to the main one.

 

Dear Barry. thanks for your reply.
is exactly that

 

I have 2*125KW + 1*68KW

The problem is some births only have 125A connectors and not 250A. so I need 2*125A to achieve my 250A capability not to have restrictions. Is a MY 43 mts

 

Im in portugal but the boat sail mainly MED and Greece/turkey

 

While what you want is possible in theory, the practice is more complicated. Simply put, you don't know how each individual marina is wired and that is an important factor for success. I am not aware of any "black box" you can buy off the shelf and solve the issue.
Besides running your own generators while berthed there is no "simple" solution. My best advice is to hire someone specialized in high power ship electrics to advise you and find a custom solution for your ship.

 

You would first have to make sure there is no phase shift or frequency difference betwee the two supplies.